Appendix 9: Preliminary RTF basis of design

A. Design Flow Rate
Storm frequency, year	1
Storm frequency, hour	2
Rainfall interval, minutes	15
Peak instantaneous flow rate (cfs)	330
Peak influent design flow rate, cubic feet per second (cfs)	495
Total design storm volume, million gallons (MG)	14.8
B. Trash Rack
Type	Manual
Location	Influent stilling well
Clear opening, inches	4
Number of units	2 (one vertical, one inverted at 60°)
Materials of construction	Aluminum or stainless steel
Length, feet	42
Height, feet	4 (vertical), 7 (inverted)
C. Grit/Debris Removal Facilities
Type	Grit sump
Location	Influent stilling well
Grit Sump Dimensions, length x width x depth, feet	42 x 5 x 3
Removal mechanism	Clamshell with overhead bridge crane
Disposal	Truck hauler
Estimated grit/debris quantity, cubic yards/year	535
D. Influent Pumps
Pump type	Mixed flow
Number of units	3 (2 operating, 1 standby)
Capacity per unit, cfs	165
TDH, feet	27
Pump column diameter, inches	54
Pump suction bell diameter, inches	78
Motor horsepower	600
Drive type	Constant speed
Motor voltage, volts	460
Pump speed, rotations per minute (rpm)	295
Potential manufacturers	Fairbanks Morse, Patterson
E. Vortex Solids Separator Influent Gates
Type	Motor-operated sluice gate
Materials of construction	Fabricated stainless steel
Number	2
Size, width x height, inches	72 x 72
Potential manufacturers	Rodney Hunt, Fontaine
F. Vortex Solids Separator
Type	USEPA swirl concentrator
Design settleable solids recovery, percent	90
Number of units	9
Capacity per unit, cfs	170
Materials of construction	Reinforced concrete basin with coated steel internals
Inlet channel, Dl, inches	72x72
Chamber diameter, D2, feet	42
Scum ring diameter, D3, feet	28
Overflow weir diameter, D4, feet	23.3
Chamber depth, H, feet	10.5
Basin volume, cubic feet	12,640
Underflow pipe diameter, inches	24
Overflow pipe diameter, inches	72
G. Underflow Control/Dewatering Pump
Underflow rate, cfs (maximum)	16.5
Percent of design peak influent flow	5
Discharge	Force main to main interceptor sewer
Number of force mains	2
Force main diameter, inches	16
Pump type	Submersible, recessed impeller, grit handling
Number of units	3 (2 installed, 1 spare)
Design dewatering duration (one pump operating), hours	48
Design points
- Underflow control rate, gallons per minute (gpm)	3,700
- Dewatering rate, gpm	2,930
Pump discharge diameter, inches	10
Motor horsepower	60
Pump speed, RPM	1,780
Drive type	Variable frequency drive
Potential manufacturers	Hayword Gordon, Wemco
H. Disinfection Chemical Storage Equipment
1. Chlorination
a. Chlorination Chemical
Type	Liquid Sodium Hypochlorite
Design chemical strength, percent	10
b. Chlorination Chemical Storage
Type	Vertical, cross-linked HOPE
Number of tanks	2
Nominal capacity, gallons (each tank)	2000
Working volume, gallons (each tank)	1,500
Potential tank manufacturer	Nalgene, Chem-Tainer
2. Dechlorination
a. Dechlorination Chemical
Type	Liquid Sodium Metabisulfite
Design chemical strength, percent	38
b. Dechlorination Chemical Storage
Type	Vertical, cross-linked HDPE
Number of tanks	2
Nominal capacity, gallons (each tank)	500
Working volume, gallons (each tank)	450
Potential tank manufacturer	Nalgene, Chem-Tainer
I. Disinfection Chemical Feed Equipment
1. Chlorination
Dosage, mg/L	14
Chlorination chemical feed point	Chlorination chamber of disinfection tank
Type of chemical feed pumps	Peristaltic, variable speed
Potential pump manufacturers	Watson Marlow/Bredel
Number of on-line chemical feed pumps	2
Number of installed backup chemical feed pumps	2
Total number of chemical feed pumps	4
Design feed rate, gallons per hour	630
Chemical feed pump capacity, gallons per hour	1,386
Motor horsepower	2
Number of chemical inductors	2
Potential chemical inductor manufacturer	USFilter/Waterchamp
Motor horsepower	7.5
2. Dechlorination
Dosage, mg/L	11
Dechlorination	Dechlorination chamber of disinfection tank
Type of chemical feed pumps	Peristaltic, variable speed
Potential manufacturers	Watson Marlow/Bredel
Number of on-line chemical feed pumps	1
Number of installed backup chemical feed pumps	1
Total number of chemical feed pumps	2
Design feed rate, gallons per hour	342
Chemical feed pump capacity, gallons per hour	528
Motor horsepower	1.5
Number of chemical inductors	2
Potential chemical inductor manufacturers	USFilter/Waterchamp
Motor horsepower	7.5
3. Disinfection control
Type	Oxidation reduction potential
Potential manufacturers	USFilter/Stranco
4. Sample pumps for disinfection control
a. Chlorination
Sample point location	Chlorination chamber of disinfection tank
Type of sample pump	Non-clog, submersible
Potential pump manufacturers	Flygt Pumps
Number of sample pumps for chlorination control	2 (1 uninstalled spare)
Design capacity range	45 to 75 gpm
Motor horsepower	1.8
b. Dechlorination
Sample point location	Dechlorination chamber of disinfection tank
Type of sample pump	Non-clog, submersible
Potential pump manufacturers	Flygt Pumps
Number of sample pumps for dechlorination control	2 (1 uninstalled spare)
Design capacity range	45 to 75 gpm
Motor horsepower	1.8
J. High-rate disinfection tank
Type	Cast-in-place, reinforced concrete, plug flow
Approximate area, square feet	12,000
Design water depth, feet	16.8
Approximate volume, cubic feet	134,000
Length to width ratio	31 to 1
Chlorination contact time @ 330 cfs, minutes	5.0
Dechlorination contact time @ 330 cfs, minutes	1.0
Method of washdown	Tipping buckets
Potential tipping bucket manufacturers Waste	Tech, John Meunier, GNA
K. Outfall
Type	Reinforced concrete culvert with flexible flap valves
Location	Disinfection tank effluent
Design flow rate, cfs	495
Dimensions, length x width x depth, feet	49 x 16 x 11
L. Facilities Information
1. Building
Foundation type	Reinforced concrete footing, walls, and slabs
Approximate area, square feet	24 000
Architectural features	Concrete masonry block walls, flat roof
Roof type	Precast concrete T-beams and planks
2. Electrical/Instrumentation
Incoming power information	Primary metering, dual/redundant service with electrically operated main and tie fused switches
Primary voltage, kilovolts	13.2
Switchgear voltage, kilovolts	13.2
Facility distribution	Individual transformers for each influent pump and dual/redundant transformers for the remaining plant load with electrically operated main fused switches and breakers to a main switchboard
Controls	Programmable logic controller based controls with coordinated communication with existing/planned County systems
3. Heating
Type	Natural gas-fired, pulse-type hydronic boilers
Estimated heating load, million BTUs	3.0
4. Ventilation
RTF air changes per hour (ACPH) during event and occupied, wet areas	12
RTF ACPH during nonevent, wet well only	2
Storage Tank ACPH during event and occupied	6
Wet area exhaust	To odor control system
5. Odor Control System
Type	Activated carbon multiple canister system utilizing water regenerable carbon
Number of vessels	4
Unit dimensions, length x width x height, feet	32x6x11
Total air flow rate, cubic feet per minute	116,000
Unit capacity, cubic feet per minute	30,000
Potential manufacturers	Calgon Carbon
6. Noise Control Measures
Reduced noise generation will be criteria in selecting all equipment
Wall construction adjacent to spaces containing noise generating equipment (pump room, odor control room, etc.) will employ noise dampening measures (acoustical block, noise dampeners, etc.)
Acoustical louvers will be used for inlet louvers connected to spaces containing noise generating equipment
Rooftop equipment (i.e., supply fans) will be housed in sound attenuating enclosures
M. Emergency Controlled Diversion
Type	Reinforced concrete culvert with flexible flap valves
Location	Influent sump
Design flow rate, cfs	1000

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Susan Miller, Project Deputy Director
Phone 315-435-2260   Fax 315-435-5023
 Onondaga County Dept of Water Environment Protection